HERE Android SDK Developer's Guide

Route Serialization

Route serialization is a feature that allows users to use the Route methods to serialize a route into binary data, which can then be saved as a file. You can also use Route class to generate a route from a previously serialized route without going through the route calculation process. This is useful when a user wants to recover from a crash during navigation or when a user wants to transfer a route from another device.

Note: Route serialization is currently offered as a beta feature. APIs may change without notice.

Route serialization currently only supports car , bike, truck, and pedestrian routes. Public Transit , Indoor Venue, and Urban Mobility routes cannot be serialized. Route serialization also does not work when the map version from which a route is serialized does not match the current map version. Route serialization also fails if the binary data containing the serialized route is tempered with or corrupted. In these cases, a specific SerializerError error code is returned.

Both asynchronous and synchronous operations are supported. To asynchronously serialize a route, perform the following:

Route route;
//assume that route calculation was already performed

Route.SerializtionCallback sCallback = new SerializationCallback() {
  @Override
  public void onSerializationComplete(Route.SerializationResult result) {
    //do something with data
    byte[] data = result.data;
  }
};

Route.serializeAsync(route, sCallback);

To asynchronously deserialize a route:

byte[] data;
//assume 'data' is a previously-serialized route

Route.DeserializationCallback dCallback = new DeserializationCallback() {
  @Override
  public void onDeserializationComplete(Route.Deserialization result){
    //do something with the route
    Route route = result.route;
  }
};

Route.deserializeAsync(data, dCallback);

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